EFFECTS OF HYDROGEN INDUCTION IN A DIESEL ENGINE OPERATING WITH BIODIESEL B20 AT DIFFERENT INJECTION TIMINGS

The blended biodiesel with up to 20% biodiesel in petroleum diesel (B20) is considered as available in production. Previous studies investigating the effect of B20 on engine emissions led to some contradictory results. The present study continued the investigation on B20 effects and was also extended on B20 enriched with hydrogen. It was conducted on a conventional tractor diesel engine running alternatively with B20 and petroleum diesel at various speeds and full load and then, with the same fuels enriched with hydrogen, at 60% load and two speeds. It was found that compared with petroleum diesel, the engine fueled with B20 has higher NOX emissions at all speeds and lower smoke and CO emissions while both fuels combustion closely resembles. The possibilities to enhance the effects of hydrogen addition to B20 fuel by modifying the injection timings were also explored by numerical simulation of the engine operation using the AVL BOOST v2011.1 code.

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